Add serialVersionUID to Serializable classes

Each serializable class withouth serialVersionUID produces an eclipse
warning. It also means that the class has undefined versioning and
cannot be be upgraded -- this patch fixes all such classes.

Change-Id: I57696f47b312517acd44799e10850f4887dab2e5
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "Add serialVersionUID to Serializable classes"